From Maleeat to Serampour, distance 20½ Statute Miles. By J. Rennell, Surveyor. June, July 1764. Scale 500 yards to an Inch. Lithographed facsimile of manuscript map X/423/2.
No scale given. Manuscript tracing by Barlow, mounted on paper. 'Traced from an Engraved Chart of Lloyd's Survey (1836).' Inset: Relative Sizes Of The Auckland Island In 1836 And Jany. 1847. No scale given.
Surveyed Dec: 1857, and January & February 1858. Scale 2000 yards to the Inch. Joseph Obbard, River Surveyor, H.C.S.V. Spy, off Calcutta, Feb. 22, 1858. Manuscript copy by Barlow. 'Reduced from the original Scale of 1000 yards to 1 inch.' Further annotated by Barlow. Formerly numbered 18.
Surveyed in July 1843. A. Bedford, River Surveyor, Calcutta, August 2nd 1843. Scale of 1 inch to 1000 yards. Manuscript tracing by Barlow ('R. Fred: Barlow Transct: Oct: 1843'). Annotated by Barlow: 'Never has been engraved nor lithographed to my knowledge.'